Rendering Firebase data into FlatList - firebase

Question

I am using React Native, Rematch for Redux and Firebase Firestore. I am attempting to pull data from my Firebase database and populate it inside my FlatList. The problem is, it is not giving me any error and it giving me a blank white screen. I do not know where I am going wrong.
This is what my database looks like - list of activities
This is what my Rematch for Redux store looks like:
import firebase from 'firebase';
import db from '../config/firebase'
const activity = {
state: {},
reducers: {
activities(state, payload) {
return {
...state,
...payload
}
},
},
effects: {
async getActivities() {
try {
const response = await db.collection('activities').get()
//console.log(response.docs.map(doc => doc.data()))
return dispatch({ type: 'activity/activities', payload: response.docs.map(doc => doc.data()) })
} catch (err) {
alert(err)
}
},
}
}
export default activity
Here is the component where I am using the FlatList:
import * as React from 'react';
import {
Text,
TouchableOpacity,
View,
FlatList,
ImageBackground
}
from 'react-native';
import styles from '../styles'
import { connect } from 'react-redux';
import '#expo/vector-icons';
import 'redux';
class Activities extends React.Component {
state = {
movetoArray: [],
outputActivity: [],
};
async componentDidMount() {
const activities = await this.props.getActivities()
this.state.movetoArray = Object.values(activities)
this.state.outputActivity = Object.entries(this.state.movetoArray[1]).map(item => ({ ...item[1], key: item[0] }));
//this.state.arrayActivity = Object.entries(activities).map(item => ({...item[1], key: item[0]}));
console.log(this.state.outputActivity)
}
_renderItem = ({ item }) => (
<TouchableOpacity
onPress={() => this.props.navigation.navigate('activitiesMD',
{
title: item.name,
objectData: item.data
})}>
<ImageBackground source={item.image} style={styles.inputTiles} imageStyle={{ borderRadius: 10 }}>
<View style={styles.inputTileTextView}>
<Text style={[styles.inputTileText, { color: item.colour }]}>{item.name}</Text>
</View>
</ImageBackground>
</TouchableOpacity>
);
render() {
const { routeName } = this.props.navigation.state
return (
<View style={styles.container}>
<FlatList
data={this.state.outputActivity}
keyExtractor={item => item.id}
renderItem={this._renderItem}
/>
</View>
);
}
}
const mapState = (state) => ({
activity: state.activity,
})
const mapDispatch = (dispatch) => ({
getActivities: () => dispatch.activity.getActivities(),
})
export default connect(mapState, mapDispatch)(Activities)
I do not know why I am getting this outcome. Please help me :)

Answer 1

If you directly mutate state in React then the component won't re-render. Please use this.setState({ ... }) like so:
- this.state.movetoArray = Object.values(activities)
- this.state.outputActivity = Object.entries(this.state.movetoArray[1]).map(item => ({ ...item[1], key: item[0] }));
+ this.setState({ movetoArray: Object.values(activities), outputActivity: Object.entries(this.state.movetoArray[1]).map(item => ({ ...item[1], key: item[0] })) })